﻿using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Text.RegularExpressions;
namespace vpn
{
    public class VPNHelper
    {
        // 系统路径 C:\windows\system32\
        private static string WinDir = Environment.GetFolderPath(Environment.SpecialFolder.System);
        // rasdial.exe
        private static string RasDialFileName = "rasdial.exe";
        // VPN路径 C:\windows\system32\rasdial.exe
        private static string VPNPROCESS = System.IO.Path.Combine(WinDir , RasDialFileName);
        // VPN地址
        public string IPToPing { get; set; }
        // VPN名称
        public string VPNName { get; set; }
        // VPN用户名
        public string UserName { get; set; }
        // VPN密码
        public string PassWord { get; set; }

        public VPNHelper()
        {
        }
        /// <summary>
        /// 带参构造函数
        /// </summary>
        /// <param name="_vpnIP"></param>
        /// <param name="_vpnName"></param>
        /// <param name="_userName"></param>
        /// <param name="_passWord"></param>
        public VPNHelper(string _vpnIP, string _vpnName, string _userName, string _passWord)
        {
            this.IPToPing = _vpnIP;
            this.VPNName = _vpnName;
            this.UserName = _userName;
            this.PassWord = _passWord;
        }
        /// <summary>
        /// 尝试连接VPN(默认VPN)
        /// </summary>
        /// <returns></returns>
        public void TryConnectVPN()
        {
            this.TryConnectVPN(this.VPNName, this.UserName, this.PassWord);
        }
        /// <summary>
        /// 尝试断开连接(默认VPN)
        /// </summary>
        /// <returns></returns>
        public void TryDisConnectVPN()
        {
            this.TryDisConnectVPN(this.VPNName);
        }
        /// <summary>
        /// 创建或更新一个默认的VPN连接
        /// </summary>
        public void CreateOrUpdateVPN()
        {
            this.CreateOrUpdateVPN(this.VPNName, this.IPToPing);
        }
        /// <summary>
        /// 尝试删除连接(默认VPN)
        /// </summary>
        /// <returns></returns>
        public void TryDeleteVPN()
        {
            this.TryDeleteVPN(this.VPNName);
        }
        /// <summary>
        /// 尝试连接VPN(指定VPN名称，用户名，密码)
        /// </summary>
        /// <returns></returns>
        public void TryConnectVPN(string connVpnName, string connUserName, string connPassWord)
        {
            try
            {
                string args = string.Format("{0} {1} {2}", connVpnName, connUserName, connPassWord);
                ProcessStartInfo myProcess = new ProcessStartInfo(VPNPROCESS, args);
                myProcess.CreateNoWindow = true;
                myProcess.UseShellExecute = false;
                Process.Start(myProcess);
            }
            catch (Exception Ex)
            {
                Debug.Assert(false, Ex.ToString());
            }
        }
        /// <summary>
        /// 尝试断开VPN(指定VPN名称)
        /// </summary>
        /// <returns></returns>
        public void TryDisConnectVPN(string disConnVpnName)
        {
            try
            {
                string args = string.Format(@"{0} /d", disConnVpnName);
                ProcessStartInfo myProcess = new ProcessStartInfo(VPNPROCESS, args);
                myProcess.CreateNoWindow = true;
                myProcess.UseShellExecute = false;
                Process.Start(myProcess);

            }
            catch (Exception Ex)
            {
                Debug.Assert(false, Ex.ToString());
            }
        }
        /// <summary>
        /// 创建或更新一个VPN连接(指定VPN名称，及IP)
        /// </summary>
        virtual public void CreateOrUpdateVPN(string updateVPNname, string updateVPNip)
        {
            //RasDialer dialer = new RasDialer();
            //RasPhoneBook allUsersPhoneBook = new RasPhoneBook();
            //allUsersPhoneBook.Open();
            //// 如果已经该名称的VPN已经存在，则更新这个VPN服务器地址
            //if (allUsersPhoneBook.Entries.Contains(updateVPNname))
            //{
            //    allUsersPhoneBook.Entries[updateVPNname].PhoneNumber = updateVPNip;

            //    // 不管当前VPN是否连接，服务器地址的更新总能成功，如果正在连接，则需要VPN重启后才能起作用
            //    //allUsersPhoneBook.Entries[updateVPNname].Update();
            //}
            //// 创建一个新VPN
            //else
            //{
            //    RasEntry entry = RasEntry.CreateVpnEntry(updateVPNname, updateVPNip, RasVpnStrategy.PptpOnly, 
            //        RasDevice.GetDeviceByName("(PPTP)", RasDeviceType.Vpn));
            //    allUsersPhoneBook.Entries.Add(entry);
            //    dialer.EntryName = updateVPNname;
            //    dialer.PhoneBookPath = RasPhoneBook.GetPhoneBookPath(RasPhoneBookType.AllUsers);
            //}
        }
        /// <summary>
        /// 删除指定名称的VPN
        /// 如果VPN正在运行，一样会在电话本里删除，但是不会断开连接，所以，最好是先断开连接，再进行删除操作
        /// </summary>
        /// <param name="delVpnName"></param>
        virtual public void TryDeleteVPN(string delVpnName)
        {
            //RasDialer dialer = new RasDialer();
            //RasPhoneBook allUsersPhoneBook = new RasPhoneBook();
            //allUsersPhoneBook.Open();
            //if (allUsersPhoneBook.Entries.Contains(delVpnName))
            //{
            //    allUsersPhoneBook.Entries.Remove(delVpnName);
            //}
        }
        public bool Connect(string Server, string VPNName, string username, string password)
        {
            CreateOrUpdateVPN(VPNName, Server);
            TryConnectVPN(VPNName, username, password);
            return true;
        }

        public bool Disconnect(string VPNName)
        {
            TryDisConnectVPN(VPNName);
            //if (OSType.Equals("win7"))
            //{

            //}
            //else if (OSType.Equals("xp"))
            //{

            //}
            //else
            //{
            //    return false;
            //}

            return true;
        }
     }
}